Question

Veliger larva is modified
A. Redia larva
B. Trochophore larva
C. Sporocyst larva
D. Planula larva

Answer 1

Larva: It is a stage in the development of many animals, occurring after birth or hatching and before the adult form is reached.
These immature, active forms are structurally different from the adults and are well adapted to a different atmosphere.
Different types of insects have different names for their larvae.
For insects that undergo incomplete metamorphosis the larvae are also known as nymphs.

Complete answer:
In order to solve this question we need to learn more about larva.
Larva: It is a juvenile form which many animals undergo before metamorphosis into adults.
Animals with indirect development such as insects, amphibians, typically have a larval phase of their life cycle.
The larva's appearance is considerably very different from the adult form (e.g. caterpillars and butterflies).
Their diet may also be considerably different.
Animals in the larval stage will consume food to transform themselves into an adult form.
Veliger is a form of planktonic larvae.

This type of larvae is found in different types of snails which have fresh water and sea water as habitat.
This group includes the gastropod molluscs, bivalve molluscs and shells.
A veliger larva hatches from the egg capsules.
Certain veliger larvae develop from the early trochophore larval stage.

Trochophore larva: It is a small, translucent, free-swimming larva characteristic of marine annelids and most groups of mollusks.

Redia larva: It is a larval form of a digenetic trematode (such as a liver fluke) that is produced within a sporocyst which consists of a mouth, pharynx, and gut.

Sporocyst larva: It is a larval form of trematode (fluke) which develops into the body of its molluscan which is an intermediate host, Such as snail.

Planula larva: It is the free-swimming, flattened, ciliated, bilaterally symmetric larval form of various cnidarians species.

So, the correct option is option B. Trochophore larva.
Note: Once a cockroach hatches, the young, small cockroach is called a nymph.
The nymphs go through the process known as molting, where they shed their skin and after that their bodies become white.
This molting behavior happens anywhere from 10 to 13 times until they become a full-grown adult cockroach and soft.